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run code in 200+ php & hhvm versions
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<?php $a = array("1" => 5, 2 => 10, 3, "2" => 7); var_dump($a);
based on 4kTDg
Output for 4.3.0 - 7.2.0
array(3) { [1]=> int(5) [2]=> int(7) [3]=> int(3) }